Aqueous binder and preparation method thereof, glued diaphragm and preparation method thereof, and lithium ion secondary battery

• Main Authors: XIONG HOUGAO, HE WEI, ZHU ZHONGSI, GU LANBING, LIU JINCHENG, LI QIANWEI
• Format: Patent
• Language: Chinese; English
• Published: 15.01.2021
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; BASIC ELECTRIC ELEMENTS; CHEMISTRY; DYES; ELECTRICITY; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; PAINTS; POLISHES; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; USE OF MATERIALS AS ADHESIVES

The invention discloses a water-based binder and a preparation method thereof, a glued diaphragm and a preparation method thereof, and a lithium ion secondary battery. The water-based binder comprisesthe following raw materials: a point-bonded polymer, a surface-bonded polymer and a polymer lithium salt, wherein the point-bonded polymer is a granular polymer; and the surface-bonded polymer is a water-soluble polymer, and has a molecular mass of 100,000-1,000,000 and a glass-transition temperature of higher than 60 DEG C. The problems of hole blockage, coulombic efficiency reduction and the like after hot pressing of the glued diaphragm are solved. 本发明公开了一种水性粘结剂、制备方法、涂胶隔膜、制备方法及锂离子二次电池。所述水性粘结剂的原料包括点粘结聚合物、面粘结聚合物和聚合物锂盐；所述点粘结聚合物为颗粒状聚合物；所述面粘结聚合物为水溶性聚合物，分子质量在10万～100万之间，玻璃化转变温度高于60℃。解决了涂胶隔膜热压后堵孔及库伦效率降低等问题。